

public class PersionTest {
    public static void main(String[] args) {
        Persion p1=new Persion();
      
        p1.show(); // name:null age:0
        Persion p2 = new Persion("Tom", 20);
        p2.show();
        Persion p3 = new Persion("Jerry");
        p3.show();
        Persion p4 = new Persion(30);
        p4.show();
        
    }
    
}
